Improvement in electric alarm



' c. T. MASON Burglar; Alarm.

No. 89,936.. Patentd ma 1869.-

n, PETERS. Phalo-unwgrapmr. Washington, 0. c,

hereinafter more fully described.

ing over said wall or fence.

latent dtiijiitt.

CHARLES T. MASON, OF SUMTER, SOUTH CAROLINA.

Letters Patent No. 89,936, dated May 11, 1869.

IMPROVEMENT IN ELECTRIC ALARM The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, CHARLES TJMASON, of Sumter, in the district of Sumter, and State of South Carolina, have invented a new and improved Electric Alarm; and I do hereby declare that the tbllowingis a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same, reference being had tothe accompanying drawings, forming part of this specification, in which- Figure 1 represents a fence or wall to which my improved device has been attached."

Figure 2 is a vertical SvCtlOD of the same, taken through the line a; x, fig. 1.

Figure 3 is a vertical section of the same, taken through the line y y, fig. 1.

Similar letters of reference indicate corresponding parts.

My invention has for its object to furnish an improved device for protecting prisons, banks, public and private gardens, grounds, 860,, and other places, which shall be reliable in operation, and, at the same time, simple in construction; and

It consists in the combination of parts, as will be A represents the wall or fence of a prison-yard, gar-' den, pleasure-ground, or other enclosure, into which ingress, or from which egress may be sought by climb-- B is the connecting-wire of a galvanic circuit, which is extended along the fence or wall A, in such aposition that it will be impossible to get over said wall without touching said wire and breaking the circuit.

The wire, B, may be insulated, or covered with some suitable material, and passes over rollers C, so that it maymove easily when touched.

The wire, B, is divided up into sections of suitable length, the ends of each section being attached to springs D, set into recesses in the posts, or other convenient pzirt of the fence or wall A.

The springs D, and the recesses in which they are placed, are covered and protected by the covers E, to the inner side of which is attacheda small metal arm, F, which passes between the springs D of the contiguous ends of two adjacent sections of the wire, B, and against which both of said springs rest when the said wire,'B, is undisturbed, completing the circuit.

Butshould the wire, B, be disturbed, one ofthe springs D will be drawn away from the arm F, breaking the circuit and sounding the alarm.

Doors, gates, windows, 850., may be connected with the circuit-wire B, or they may be provided with acircnit-wire of their own. The latter coristrnction I prefer.

In this case, the wire, G, which forms the circuit, is connected with the hinges of the door or gate H, and passes along or through said door or gate, to its forward edge, where its end rests against a. metal spring orplate, I, attached to the door or gate-post, and which isconnected with the continuation of said wire, G, so that should the said door or gate be opened in the slightest degree, the circuit wilibe broken and the alarm sounded.

I In the js'ame manner the wire, G, may be connected with a window, so that raising the window will break the circuit and sound the alarm.

Using a separate wire for the gates, doors, or win CHARLES T. MASON.

Witnesses Q. A. McKAcEN, J. F. W. DE LORME. 

